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Title : TCP Retransmit (RXT) Flag
Author(s) : R. Ludwig
Filename : draft-ludwig-tsvwg-tcp-rxt-flag-01.txt
Pages : 9
Date : 26-Jul-01
This document proposes a solution to TCP∆s retransmission ambiguity
problem. It is based on using a single bit, named the Retransmit
(RXT) flag, taken from the Reserved field of the TCP header. The TCP
sender sets the RXT flag in segments containing retransmitted data.
In response to such a segment, the TCP receiver sends an immediate
pure ACK with the RXT flag set. By inspecting the RXT flag of the
first new ACK that arrives after a retransmit, the TCP sender can
detect whether the retransmit was spurious.
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